/*
 * MakefileTokenMarker.java - Makefile token marker
 * Copyright (C) 1998, 1999 Slava Pestov
 *
 * You may use and modify this package for any purpose. Redistribution is
 * permitted, in both source and binary form, provided that this notice
 * remains intact in all source distributions of this package.
 */

package org.syntax.jedit.tokenmarker;

import javax.swing.text.Segment;

/**
 * Makefile token marker.
 * 
 * @author Slava Pestov
 * @version $Id: MakefileTokenMarker.java,v 1.18 1999/12/13 03:40:30 sp Exp $
 */
public class MakefileTokenMarker extends TokenMarker
{
    // public members
    public byte markTokensImpl(byte token, Segment line, int lineIndex)
    {
        char[] array = line.array;
        int offset = line.offset;
        int lastOffset = offset;
        int length = line.count + offset;
        boolean backslash = false;
        loop: for (int i = offset; i < length; i++)
        {
            int i1 = (i + 1);

            char c = array[i];
            if (c == '\\')
            {
                backslash = !backslash;
                continue;
            }

            switch (token)
            {
            case Token.NULL:
                switch (c)
                {
                case ':':
                case '=':
                case ' ':
                case '\t':
                    backslash = false;
                    if (lastOffset == offset)
                    {
                        addToken(i1 - lastOffset, Token.KEYWORD1);
                        lastOffset = i1;
                    }
                    break;
                case '#':
                    if (backslash)
                        backslash = false;
                    else
                    {
                        addToken(i - lastOffset, token);
                        addToken(length - i, Token.COMMENT1);
                        lastOffset = length;
                        break loop;
                    }
                    break;
                case '$':
                    if (backslash)
                        backslash = false;
                    else if (lastOffset != offset)
                    {
                        addToken(i - lastOffset, token);
                        lastOffset = i;
                        if (length - i > 1)
                        {
                            char c1 = array[i1];
                            if (c1 == '(' || c1 == '{')
                                token = Token.KEYWORD2;
                            else
                            {
                                addToken(2, Token.KEYWORD2);
                                lastOffset += 2;
                                i++;
                            }
                        }
                    }
                    break;
                case '"':
                    if (backslash)
                        backslash = false;
                    else
                    {
                        addToken(i - lastOffset, token);
                        token = Token.LITERAL1;
                        lastOffset = i;
                    }
                    break;
                case '\'':
                    if (backslash)
                        backslash = false;
                    else
                    {
                        addToken(i - lastOffset, token);
                        token = Token.LITERAL2;
                        lastOffset = i;
                    }
                    break;
                default:
                    backslash = false;
                    break;
                }
            case Token.KEYWORD2:
                backslash = false;
                if (c == ')' || c == '}')
                {
                    addToken(i1 - lastOffset, token);
                    token = Token.NULL;
                    lastOffset = i1;
                }
                break;
            case Token.LITERAL1:
                if (backslash)
                    backslash = false;
                else if (c == '"')
                {
                    addToken(i1 - lastOffset, token);
                    token = Token.NULL;
                    lastOffset = i1;
                }
                else
                    backslash = false;
                break;
            case Token.LITERAL2:
                if (backslash)
                    backslash = false;
                else if (c == '\'')
                {
                    addToken(i1 - lastOffset, Token.LITERAL1);
                    token = Token.NULL;
                    lastOffset = i1;
                }
                else
                    backslash = false;
                break;
            }
        }
        switch (token)
        {
        case Token.KEYWORD2:
            addToken(length - lastOffset, Token.INVALID);
            token = Token.NULL;
            break;
        case Token.LITERAL2:
            addToken(length - lastOffset, Token.LITERAL1);
            break;
        default:
            addToken(length - lastOffset, token);
            break;
        }
        return token;
    }
}
